#define  _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<time.h>
int main()
{
	int arr[3] = { 1,3,0 };
	int x = 0;
	for (int i = 0; i <3; i++)
	{
		x = x ^ arr[i];
	}
	for (int j = 0; j <= 3; j++)
	{
		x = x ^ j;
	}
	printf("%d", x);
	return 0;
}